Ford Focus C-Max Mondeo Mk3 Windscreen Rain Light Sensor 3S7T-17D547-AA

Ford Focus C-Max Mondeo Mk3 Windscreen Rain Light Sensor is a precision component from the Electronic control modules and controllers group, responsible for the automatic control of selected comfort and safety functions. A properly selected sensor allows for consistent operation of vehicle systems, ensuring predictable electronic response in changing road conditions.

Specifications and technical data

• SKU: 3S7T-17D547-AA
• Mark: Ford
• Condition: Used
• OEM Part Number: 3S7T-17D547-AA
• Substitutable numbers: 1745368, 3S7T17D547AC, 3S7T-17D547-AC, 3S7T-17D547-AA, 3S7T17D547AA
• Category: ECUs & Computer Modules

Function and application of the rain and light sensor

The rain and light sensor mounted on the windscreen is responsible for analyzing ambient conditions and transmitting signals to the body control modules. In practice, this translates into:

• automatic activation of wipers when precipitation is detected,
• adjustment of wiper frequency according to rain intensity,
• cooperation with the automatic headlight activation system depending on external light intensity,
• consistent operation with other vehicle electronic modules.

As a result, the driver receives more comfortable and predictable electronic support, and the lighting and wiper system operates in a repeatable manner consistent with the manufacturer's specifications.

Benefits of using an original Ford module

The component from the Electronic control modules and controllers group dedicated to specific Ford models ensures proper electrical and software compatibility. This means:

• maintaining the factory operating logic of automatic functions,
• correct communication with the vehicle's electrical system without the need for modifications,
• consistency with the body control module software,
• reduced risk of errors in comfort and safety systems.

Choosing an original Ford solution helps maintain stable operation of electronic systems, which is particularly important in vehicles with an extensive network of controllers.

Product characteristics and fitment

The rain and light sensor for Focus, C-Max, and Mondeo Mk3 models is structurally designed to work with a windscreen equipped with the appropriate mounting area. Proper fitment includes:

• compatibility with the intended mounting location on the windscreen,
• a connection to the electrical harness designed by the manufacturer,
• maintaining operating parameters consistent with the vehicle's factory configuration.

Such a solution facilitates service and reduces the time required to restore full functionality of the systems responsible for driving comfort.

Condition and service application

The offered element is intended for use as a service part in Ford vehicles where the existing sensor has been damaged or is malfunctioning. Replacing it with a functional module allows for the restoration of:

• stable operation of automatic wipers,
• proper response of the lighting system to changes in illumination,
• comfort of vehicle use in rain and dusk conditions.

This solution is particularly useful for repairs after windscreen replacement or in the case of errors related to sensor operation.

Expanding the electronics system in your Ford

If you are planning a comprehensive repair or upgrade of the body electronics zone in your Ford and need other components from the same group, such as comfort modules, light controllers, or window control units, check out the available parts in the Ford electronic control modules and controllers category.

More about the role of original modules in modern cars

In vehicles with advanced electronics, it is crucial to use components that comply with factory specifications to maintain the driving character and comfort systems as intended by the manufacturer. A good supplement to knowledge about the impact of original modules on vehicle behavior is an article describing how properly selected components can maintain the consistency of a brand's character – you can find more on this topic in the material Audi and emotions in their purest form. How do used parts help maintain the brand's DNA?.